I'd just break it off with her. I've been involved with one recently that pulled the waiting game. Practically begged me to date her seriously when I had already let it be known I didn't want that. When she finally came to terms with it, she was out of my life but it saved both of us the headache. I only wanted sex with occasional conversation and she wanted someone to love and take home. Be upfront with your intentions. If she ain't going for it, cut her loose and swallow the bullet. You'll save her and yourself the trouble and stress.
How long did this go on ?